For a given temperature, the vapor pressure can be defined as:
A. The pressure gradient at the VLE interface.
B. The pressure that the liquid exerts on the floor of the container.
C. The pressure that will lead to boiling.
D. The pressure that allows pure liquid and pure vapor to coexist in VLE at a specific temperature.
E. None of these are accurate descriptions.
A. Incorrect. The gradient at the interface should be 0, or very close to zero, at equilibrium.
B. Incorrect. This is the hydrostatic head and the system pressure from the Bernoulli equation.
C. Incorrect. Boiling can occur at the vapor pressure, but that is not the definition of it.
D. Correct. This is explained at the end of Section 8.1, the Motivational Example.
E. Incorrect. One of these is an accurate description.
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